| Euclides - 1884 - 182 pages
...angles thus formed cannot be both acute, nor can they be both obtuse. 49. PROPOSITION XIV. — THEOREM. **If at a point in a straight line two other straight...one and the same straight line. At the point B in** the straight line AB, let the straight lines BC, BD, upon opposite sides of AB, make the adjacent angles... | |
| Stewart W. and co - 1884 - 272 pages
...CBE, EBD, are two right angles ; therefore DBA, ABC, are together equal to two right angles. XIV. — **If, at a point in a straight line, two other straight...equal to two right angles, these two straight lines** slinll be in one and the same straight line. At the point B in the straight line A AB, let the two... | |
| Euclides - 1884 - 94 pages
...ARE NOW PUBLISHED IN A SIMILAR FORM TO THIS. PROPOSITION XIV. If at a point in a straight line, tivo **other straight lines, upon the opposite sides of it,...adjacent angles together equal to two right angles** ; then these two straight lines shall be in one and the same straight line. At the point in the straight... | |
| Euclides - 1884 - 434 pages
...ways. If the exterior angles thus formed are equal, prove A ABC isosceles. PROPOSITION 14. THEOREM. **If at a point in a straight line, two other straight lines** on opposite sides of it make the adjacent angles together equal to two right angles, these two straight... | |
| Euclides - 1884 - 214 pages
...Magnitudes which are equal to the same magnitude are equal to one another. PROPOSITION XIV. THEOREM. **If, at a point in a straight line, two other straight lines,** on the bpposite sides of it, make the adjacent angles together equal to two right angles; these two... | |
| Education - 1884 - 708 pages
...equal sides be produced, the angles on the other side of the base shall be equal. Prop. 5, Bk. I. 2. **If at a point in a straight line, two other straight lines,** Ğl'on the opposite sides of it, make the adjacent angles together eqaal to two right angles ; then... | |
| George William Usill - Surveying - 1889 - 306 pages
...two right angles. 5. If at a point in a straight line, AB, two other straight lines, c B and BD,upon **the opposite sides of it, make the adjacent angles...equal to two right angles, these two straight lines,** c B and BD, shall be in one and the same line. 6. If two straight lines cut one another, the vertically... | |
| E. J. Brooksmith - Mathematics - 1889 - 354 pages
...l. Define a. right angle, and a. rhombus. If, at a point in a straight line, two straight lines on **opposite sides of it make the adjacent angles together equal to two right angles,** they are in the same straight line. A OB, COD are two intersecting straight lines, and each of the... | |
| Edward Mann Langley, W. Seys Phillips - 1890 - 538 pages
...complementary to each Other; and each is called the complement of the other. PROPOSITION 14. THEOREM. **If at a point in a straight line two other straight lines** on opposite sides of it make adjacent angles together equal to two right angles, these two straight... | |
| |